i have used a lot of 3M & Fusor products on everything from fiberglass&carbon fiber bonded to steel, and steel to steel. the only time i have ever done body work over it was on a set of raised sheetmetal flames, which is a place where you would never notice any "ghost seam" anyway.
i personally would never use it in any part of a panel where the seam is suposed to be invisible..... period.
also while on the ghost seam subject, i am also no a fan of "panel flanges" where a lap weld is created. the extra thickness and strength from the flange will cause the panel to expand and contract differently than if it is one even thickness.
on an 80% qtr, i will usually butt weld the 2 panels together about 1/4" down from the bodyline, then i tig weld the whole seam with .035 er70s rod....about 1/2" at a time.....finishing grinding it with 36gt on a 3" angle grinder. it takes forever and sux to do, but it is about the only way of doin it where the seam is 100% invisble even with temp change induced expansion/contraction.
i have also heard of using lead over a lap weld seam, it will also hide it, i havent ever tryed it...so i have no opinion on how well that method works.
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